code: def test_common_type_two_arguments(self, xp, dtype1, dtype2):
      array1 = _generate_type_routines_input(xp, dtype1, "array")
      array2 = _generate_type_routines_input(xp, dtype2, "array")
      ret = xp.common_type(array1, array2)
      assert type(ret) == type
      return ret
  
file_path: cupy/tests/cupy_tests/test_type_routines.py
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 3 for calling the TestCommonType obj's underlying member method code with example usage: obj.test_common_type_two_arguments(xp, dtype1, dtype2) and returns: ret